EP3763277B1

EP3763277B1 - Dishwasher

Info

Publication number: EP3763277B1
Application number: EP20183486.8A
Authority: EP
Inventors: Soonyong Kwon; Yongjin Choi; Kyuchang JUNG; Shinwoo Han; Pilsu KIM; Sangsoo AHN
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2019-07-02
Filing date: 2020-07-01
Publication date: 2024-04-10
Anticipated expiration: 2040-07-01
Also published as: US20210000323A1; AU2020204431B2; US11564552B2; EP3763277A1; KR20210003481A; AU2020204431A1

Description

BACKGROUND OF THE DISCLOSURE

Field of the disclosure

The present disclosure relates to a dish washer, and more particularly, to a dish washer including an air jet generator which forms an air bubble in water.

Related Art

A dish washer is a household appliance which washes a food debris on a surface of the dish washer by high-pressure water sprayed from a spray nozzle.
The dish washer includes a tub in which a washing tank is formed, and a sump which is mounted on a bottom surface of the tub to store the water. The water stored in the sump is moved to an internal space of the tub by a pumping action of a washing pump and washes a dish disposed in the internal space of the tub. In addition, foreign maters in the water are filtered by a filter, and then, the water flows into the sump. The water circulates the sump and the tub so as to wash the dish.
Korean Laid-Open Patent Application No. 10-2018-0015929 discloses an air jet generator which forms air bubbles in water supplied to a tub using a portion of water fed by a washing pump.
However, when the above-described air jet generator sucks air, the air is in friction with the water, and thus, a noise may occur. This noise is generated when the dish washer is operated, and thus, a problem that a user is uncomfortable due to the noise.
EP 3 494 859 A1 presents a dish washer having an air jet generator that includes: an impeller which applies centrifugal force to washing water flowing in a forward direction; a decompression portion which decreases a pressure of the washing water that flows; an air suction portion which is opened to allow air to flow into the decompression portion; a pressing portion which increases pressure so as to crush the air introduced from the air suction portion; an air tap which has a plurality of holes so as to crush the air contained in the washing water that passed through the pressing portion; and a reverse spray nozzle which sprays the washing water toward the air tap in a reverse direction.
WO 2018/124717 A1 relates to a dishwasher. The dishwasher comprises: a tub for providing a washing space; a rack for accommodating dishes inside the tub; a spray nozzle for spraying washing water toward the dishes accommodated in the rack; a sump for supplying the washing water to the spray nozzle; a pump for forcibly delivering, to the spray nozzle, the washing water stored in the sump; a supply pipe for connecting the sump and the spray nozzle; and an air jet generator disposed on a supply flow path formed by the supply pipe so as to suction external air and agitate the same in the washing water flowing in the supply pipe, thereby forming air bubbles.
EP 3 494 857 A1 presents a dishwasher that includes: a spray module which sprays washing water toward dishes; a sump which supplies washing water to the spray module; a pump which pumps the washing water stored in the sump to the spray module; and an air jet generator which receives a part of the washing water pumped from the pump to form an air bubble in the washing water and discharges the air bubble to the sump, wherein the air jet generator comprises: a decompression portion which decreases a pressure of the washing water that flows; an air suction portion which is opened to allow air to flow into the decompression portion; a pressing portion which increases pressure so as to crush the air introduced from the air suction portion; and an air tap which has a plurality of holes formed therein so as to crush the air contained in washing water that passed through the pressing portion.
WO 2018/026221 At presents a dish washer that comprises: a tub having a dish washing space formed therein; a sump containing wash water to be supplied into the tub; a spray module for spraying the wash water toward dishes; a pump for supplying the wash water stored in the sump to the spray module; an air jet generator for receiving a part of the wash water discharged from the pump and generating air bubbles in the wash water; and a discharge module for discharging, to the bottom surface of the tub, the wash water including the air bubbles discharged from the air jet generator.
EP 3 494 858 A1 presents a dishwasher that includes: a tub in which a dish washing space is formed; a sump which contains washing water supplied into the tub; a spray module which sprays washing water toward dishes; a pump which supplies the washing water stored in the sump to the spray module; an air jet generator which receives a part of the washing water discharged from the pump to form an air bubble in the washing water; and a discharge module which discharges the washing water containing the air bubble discharged from the air jet generator to a side surface of the tub.

SUMMARY OF THE DISCLOSURE

The present disclosure provides a dish washer which minimizes a noise generated when air is pulverized in an air jet generator.
The present disclosure also provides a dish washer having a plurality of structures which reduces a noise generated in the air jet generator.
The structure for reducing the noise may include an air chamber on a path through which the noise is propagated. However, in the case of the air jet generator through which the water flows, when the water flows back into the air chamber, there is a problem that the water may flow into an internal space of the air chamber and remain therein. The present disclosure also provides a dish washer capable of solving the above-described problems.
An object of the present disclosure is not limited to the above-descried objects, and other objects not mentioned will be clearly understood by a person skilled in the art from the following descriptions.
The object is solved by the features of the independent claim. Preferred embodiments are given in the dependent claims.
According to the invention, a dish washer includes: a tub which forms a washing space in which a dish is disposed; a spray module which is disposed inside the tub and sprays water to the washing space; a sump in which the water is stored; a washing pump which supplies the water stored in the sump to the spray module; and an air jet generator which is disposed below a bottom surface of the tub, receives a portion of the water discharged from the washing pump to generate air bubbles in the water, and discharges the water having air bubbles to the washing space of the tub.
The air jet generator includes an air pulverizing pipe which includes a first pipe which has an inlet formed on a lower side of the first pipe, is open in an up-down direction, and has a cross-sectional area which is reduced upward, a second pipe which is disposed above the first pipe, is open in the up-down direction, and has a cross-sectional area which increases upward, and an air inlet hole which is formed around a peripheral surface of the second pipe to communicate with an outside at an inlet end portion of the second pipe. The air jet generator sucks air from an outside using a negative pressure formed in the water flowing upward and pulverizes the air flowing into the air jet generator.
Moreover, the air jet generator includes an air tab which is mounted to be inserted into an upper portion of the second pipe from above the second pipe or to be withdrawn from above the upper portion of the second pipe.
The air tab has a plurality of air holes formed vertically to the second pipe, and thus, secondarily pulverizes the air flowing into the air jet generator.
Preferably, the air jet generator may be provided in an upright or vertical position with respect to the bottom wall of the tub. So the water streaming direction inside the air jet generator is vertical.
Preferably, the air inlet hole or the air supply direction into the air pulverizing pipe extends mainly horizontally or perpendicular to the streaming direction of the water inside the air jet generator.
The air pulverizing pipe includes an extended surface portion which extends in a radial direction at a discharge end portion of the first pipe and extends an area of flow path of the inlet end portion of the second pipe, and thus, can pulverize the air flowing into the air jet generator through the air inlet hole and can reduce a noise generated when the air is pulverized.
The air inlet hole may be disposed to be separated at a predetermined interval in a radial direction from an inner circumferential surface the discharge end portion of the first pipe, and thus, it is possible to reduce the noise generated when the air flowing in through the air inlet hole.
A diameter of the inlet end portion of the second pipe may be larger than a diameter of the air inlet hole, and thus, it is possible to reduce the noise generated when the air flowing in through the air inlet hole.
The extended surface portion may be formed perpendicularly to a flow direction of the water.
Preferably, the air inlet hole may be formed perpendicularly to a direction of a flow path through which the water flows in the second pipe.
The first pipe may include a first pipe lower portion of which a cross-sectional area is reduced so that a pressure of the water flowing in the air pulverizing pipe is reduced.
Preferably, the first pipe may include a first pipe upper portion in which a change ratio of the cross-sectional area is formed to be gentler than that of the first pipe lower portion so that a flow velocity of the water flowing in through the first pipe lower portion increases or is maintained. Accordingly, a negative pressure is formed in the first pipe upper portion, and it is possible to increase the speed of the water discharged from the first pipe.
The dish washer may further include an air chamber which forms a space on a peripheral surface of the air pulverizing pipe and through which the air inlet hole and the outside communicate with each other, and thus, it is possible to reduce the noise generated by the air flowing in through the air inlet hole by the air chamber.
The air chamber may include an air guide pipe which extends along an inner lower surface of the air chamber in the air inlet hole, and thus, it is possible to prevent the water from remaining in the air chamber.
The dish washer may further include: a chamber body which forms a space inward and has one side opened on a peripheral surface of the air pulverizing pipe.
The dish washer may further include: a chamber housing cover which covers the opened one side of the chamber body.
The dish washer may further include: an impeller which has a vane forming an inclined surface in a flow direction of the water to form a swirl in the water flowing into the air pulverizing pipe, and thus, the swirl can be generated in the water flowing into the air pulverizing pipe.
The air jet generator may further include: a nozzle which is mounted above the air pulverizing pipe on an upper side of the tub and may discharge the water flowing upward through the air pulverizing pipe to the washing space of the tube, and thus, it is possible to supply the water including the air bubbles to the sump through the tub.
The nozzle may be connected to the air tab on the upper side of the air tab, and a discharge port through which the water may be discharged to the washing space may be disposed above the bottom surface of the tub in the nozzle. Accordingly, the water including the air bubbles can be discharged to the bottom surface of the tub, and it is possible to wash the bottom surface of the tub.
The discharge port formed in the nozzle may be formed toward the bottom surface of the tub.
Specific contents of other embodiments are included in the detail description and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic cross-sectional view for explaining the overall configuration of a dish washer according to an embodiment of the present disclosure.
FIG. 2 is a block diagram for explaining a flow of water in the dish washer according to the embodiment of the present disclosure.
FIG. 3 is a view for explaining a structure in which an air jet generator according to the embodiment of the present disclosure is mounted on a tub.
FIG. 4 is a perspective view of the air jet generator of the embodiment of the present disclosure.
FIG.5 is an exploded perspective of the air jet generator of an embodiment of the disclosure.
FIG. 5 is a side cross-sectional perspective view of the air jet generator of the embodiment of the present disclosure.
FIG. 7 is a side cross-sectional view of the air jet generator of the embodiment of the disclosure.
FIGS. 8A and 8B illustrate an inflow of air and a flow and friction of water in an air jet generator without having an extended pipe portion compared with the air jet generator according to the embodiment of the present disclosure, FIG. 8A illustrates the air and the water along a side cross section of a flow path, and FIG. 8B illustrates ranges of the water and the air of a cross section taken along A of FIG. 8A.
FIGS. 9A and 9B illustrate an inflow of air and a relationship between a flow and friction of the water in the air jet generator according to the embodiment of the present disclosure, FIG. 9A illustrates the air and the water along a side cross section of a flow path, and FIG. 9B illustrates ranges of the water and the air of a cross section taken along B of FIG. 9A.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

Advantages and features of the present disclosure and a method for achieving the advantages and features will become apparent by referring to an embodiment described below in detail with reference with the accompanying drawings. However, the present disclosure is not limited to the embodiment disclosed below, but may be implemented in various different forms. That is, the present embodiment is provided to make the present disclosure to be complete and to fully inform a person having ordinary knowledge in the technical field to which the present disclosure belongs of the scope of the invention, and the present disclosure is only defined by the scope of the claims. The same reference numerals indicate the same constituent elements through the entire specification.
Hereinafter, the present disclosure will be described with reference to the drawings for explaining the dish washer according to an embodiment of the present disclosure.

Dish Washer Overall Structure

Hereinafter, a configuration of a dish washer and a flow of water inside the dish washer when a dish is washed according to the present embodiment will be described with reference to FIGS. 1 and 2.
With reference to FIG. 1, a dish washer 10 according to the present embodiment includes a cabinet 20 forming an outline, a door 22 which is coupled to the cabinet 20 and opens or closes an inside of the cabinet 20, and a tub 24 which is installed inside the cabinet 20 and forms a washing space 24s to which the water or steam is applied.
The dish washer 10 according to the present embodiment may include a dispenser (not illustrated) which stores a detergent introduced by a user and introduces the detergent into the tub 24 in a washing step. The dispenser may be disposed in the door 22. The tub 24 forms the washing space 24s in which the dish is disposed in order to wash the dish.
The dish washer 10 includes racks 30 and 32 which store a dish inside the tub 24, a spray module 33 which sprays the water toward the dish accommodated in the racks 30 and 32, a sump 26 which supplies the water to the spray module 33, and a washing pump 50 which pressure-feeds the water stored in the sump 26 to the spray module 33.
The spray module 33 is configured to spray the water toward the dish, and may include at least one of the spray nozzles 34, 36, and 38 and supply pipes 42, 42, and 26 which connect the washing pump 50 and the spray nozzles 34, 36, and 38 to each other. The invention is not limited to a dish washer having two racks. Also, more than two racks and a corresponding number of nozzles and pipes are possible. But, the invention also works for a dish washer having only a single rack and one rotating nozzle one fixed top nozzle.
The dish washer 10 further includes a washing motor 52 which drives the washing pump 50, and a brushless direct current motor (BLDC) which can control a rotating speed may be used as the washing motor 52.
The dish washer 10 may further include a water supply module 60 which supplies water to the sump 60 or the spray module 33, a water discharge module 62 which is connected to the sump 26 and discharges the water to the outside.
The dish washer 10 may include a filter module 70 which installed in the sump 26 and filters the water.
The dish washer 10 may include a heating module 59 which is installed in the sump 26 and heats the water.
The dish washer 10 includes the plurality of spray nozzles 34, 36, and 38, the plurality of supply pipes 42, 44, and 46 through which the water pressure-fed from the washing pump 50 are respectively supplied to the plurality of spray nozzles 34, 36, and 38, and a channel switcher 40 which supplies the water pressure-fed from the washing pump 50 to at least one of the spray nozzles 34, 36, and 38.
The water supply module 60 is configured to receive the water supplied from the outside and supply the water to the sump 26, and opens or closes a water supply valve 61a disposed in a water supply flow path 61 to supply the water from the outside into the sump 26.
The water discharge module 62 is configured to discharge the water stored in the sump 26 to the outside and includes a water discharge flow path 64 and a water discharge pump 66.
The filter module 70 is configured to filter foreign matters such as a food debris contained in the water and is disposed in a flow path of the water flowing from the tub 26 into the sump 26.
The dish washer 10 further includes the washing pump 50 which pressure-feeds the water stored in the sump 26 to the spray nozzles 34, 36, and 38. The washing pump 50 includes a washing pump housing 51, a washing pump impeller 52 which is disposed inside the washing pump housing 51 and rotated to supply the water to the spray nozzles 34, 36, and 38, a washing motor 52 which rotates the washing pump impeller 54.
The washing pump 50 may include a heater 56 which heats the water inside the washing pump housing 51. The heater might be replaced by any other means suited for heating the water, e.g. another heater or hot water supply from outside or other suitable means.
The washing pump 50 is connected to the sump 26 through the water supply pipe 58a and connected to the channel switcher 40 through a water outlet pipe 58b. Branching pipe 80 is formed in the water outlet pipe 58b, and a portion of the water flowing from the washing pump 50 can flow to an air jet generator 100 through the branching pipe 80.
Steam generated by the heater 56, preferably disposed in the washing pump 50, flows to a steam nozzle 58c through a steam discharge pipe 58d and may be supplied into the tub 24 through the steam nozzle 58c.
The dish washer includes the air jet generator 100 which forms air bubbles having a minute size in the water.
In the dish washer according to the present embodiment, a portion of the water supplied by the washing pump 50 is supplied to the air jet generator 100 in addition to the spray module 33 through the branching pipe 80. The water is supplied to the air jet generator 100 through the flow path branched off from the washing pump 50, air flows into the supplied water, the air jet generator 100 pulverizes the supplied air to generate minute air bubbles. The air jet generator 100 is connected to the tub 24 and/or the sump 26. Accordingly, when the washing pump 50 is operated, the air jet generator 100 supplies the water having the generated air bubbles to the sump 26, and thus, the water pressure-fed to the spray module 33 includes the air bubbles.
A lower hole (not illustrated) through which a portion of an upper side of the air jet generator 100 passes is formed on a bottom of the tub 24. An upper portion of an air pulverizing pipe 110 of the air jet generator 100 described later passes through the lower hole. Therefore, a portion of the upper portion of the air pulverizing pipe 110 of the air jet generator 100 is disposed on an upper side of the tub 24.

Flow of Water inside Dish washer

The flow of the water will be described with reference to FIG. 2. The water stored in the sump 26 of the dish washer 10 is supplied to the spray module 33 through the washing pump 50, the water supplied to the spray module 33 is sprayed to the tub 24, and the water sprayed to the tub 24 flows into the sump 26 again. In the dish washer 10 according to the present embodiment, a portion of the water fed from the washing pump 50 flows into the air jet generator 100 which generates the air bubbles in the water. A portion of the water flowing through the washing pump 50 flows into the air jet generator 100 through the branching pipe 80.
A portion of the water discharged from the washing pump 50 is supplied to the air jet generator 100. The water flowing into the air jet generator 100 passes through an impeller 170, an air inlet hole 146, the air pulverizing pipe 110 including a first pipe 120 and a second pipe 130, and an air tab 180, and thus, the air bubbles are generated in the water. That is, the water flowing into the air jet generator 100 flows swirly by the impeller 170. Thereafter, a speed of the water increases while passing through the first pipe 120, and air flowing into the air inlet hole 146 is primarily pulverized by the washing waster which is rotated at a high speed by the impeller 170 and the first pipe 120. Moreover, the water is secondarily pulverized while passing through the second pipe 130. The water is thirdly pulverized while passing through the air tab 180, and thus, includes air bubbles having a minute size.
The water including the air bubbles flows into the sump 26 again. The water including the air bubbles may be discharged to the tub 24 and may flow into the sump 26. Accordingly, when the washing pump 50 is operated by operating the dish washer 10, the air bubbles are generated in the water.

Configuration of Air Jet Generator

Hereinafter, a configuration and disposition of the air jet generator 100 according to the present disclosure will be described with reference to FIGS. 3 to 9B.
The air jet generator 100 is disposed on a rear side of a bottom surface 25 of the tub 24. The air jet generator 100 according to the present embodiment may be disposed at an edge side of the bottom surface 25 of the tub 24.
Referring to FIG. 3, a mounting hole (not illustrated) through which a partial configuration of the air jet generator 100 passes is formed in a portion of the tub 24 on which the air jet generator 100 is mounted, and a mounting surface 25b on which the air jet generator 100 is mounted is formed around the mounting hole.
A fixing ring 190 described later is disposed above the mounting surface 25b. The mounting surface 25b forms a flat surface to be in close contact with a lower side of the fixing ring 190.
The air jet generator 100 forms a flow path perpendicular to the bottom surface 25 of the tub 24 or a ground and has a shape of a venturi tube, and includes the air pulverizing pipe 110 in which the air inlet hole 146 through which an external air flows in from one side is formed.
The air jet generator 100 includes the air tab 180 which pulverizes the air existing in the water discharged from the air pulverizing pipe 110.
Further, the air jet generator 100 includes an air chamber 150 which forms a space through which the air flows therein and forms an air inlet hole 146 communicating with an inside of the air pulverizing pipe 110 on one side of a lower portion of the second pipe 130. Moreover, the air jet generator 100 according to the present embodiment may further include the impeller 170 which applies a centrifugal force to the water flowing to the air pulverizing pipe 110.
The dish washer 10 may further include the branching pipe 80 which causes a portion of the water flowing from the washing pump 50 to the spray module 33 to flow to the air jet generator 100. An end portion of the branching pipe 80 is coupled to the lower portion of the air pulverizing pipe 110. The branching pipe 80 and the air pulverizing pipe 110 may be coupled to each other using a fusion method.
A portion of the water flowing through the water outlet pipe 58b is supplied to the air jet generator 100 through the branching pip 80. That is, the branching pipe 80 branches off at the water outlet pipe 58b and is connected to the air jet generator 100.
The impeller 170 which applies a centrifugal force to the water flowing into the air pulverizing pipe 110 may be disposed at the end portion of the branching pipe 80. An impeller mounting portion 82 on which the impeller 170 is mounted may be formed inside one side of the branching pipe 80. The impeller 170 may be coupled to the impeller mounting portion 82 of the branching pipe 80 by a fusion method.
The impeller 170 includes a cylindrical impeller peripheral portion 172 and a vane 174 which is disposed inside the impeller peripheral portion 172 and forms a swirl in the water. In the impeller 170, an outer surface of the impeller peripheral portion 172 is disposed to abut on an inside of a discharge end portion of the branching pipe 80. As the water passing through the impeller 170 passes through the vane 174, the water is rotated to generate the swirl.
The vane 174 of the impeller 170 applies the centrifugal force to the water flowing through the first pipe 120. The vane 174 of the impeller 170 may be fixed or rotated, and the water passing through the vane 174 is rotated and flows into the air pulverizing pipe 110.
The air pulverizing pipe 110 has the shape of a venturi tube and pulverizes the air flowing through the air inlet hole 146 by the water flowing through the air pulverizing pipe 110.
The air pulverizing pipe 110 includes the first pipe 120 in which a cross-section area is reduced in a direction in which the water flows to reduce a pressure of the water flowing through the air pulverizing pipe 110, and the second pipe 130 in which a cross-sectional area increase in the direction in which the water flows to pressurize the water including the air. Each of the first pipe 120 and the second pipe 130 has the channel which is open in an up-down direction. The first pipe 120 is located on an upstream side of the second 130. The first pipe 120 is located below the second pipe 130.
The air inlet hole 146 through which the external air flows into the air pulverizing pipe by a negative pressure generated in the pipe is formed on a peripheral surface of a lower end portion of the second 130. The air inlet hole 146 is formed on an upstream end portion of the second 130.
The air pulverizing pipe 110 is disposed below the bottom surface 25 of the tub 24. The air pulverizing pipe 110 is disposed to be perpendicular to the ground or the bottom surface 25 of the tub 24.
In the air pulverizing pipe 110, the first pipe 120, the second pipe 130, and an air tab mounting portion 116 are disposed in this order in the direction in which the water flows i.e. in upward direction.
The air pulverizing pipe 110 further includes an air tab mounting portion 116, on which the air tab 180 is mounted, at the discharge end portion through which the water is discharged. The air tab mounting portion 116 has a shape which surrounds the air tab 180 so that the air tab 180 is inserted into the air tab mounting portion 116. The air tab mounting portion 116 is disposed on an upper side of the air pulverizing pipe 110.
A size of an inlet cross section 122d of the first pipe 120 is smaller than a size of a discharge cross section 134d of the second pipe 130. The air pulverizing pipe 110 according to the present embodiment is disposed to be perpendicular to the ground or the bottom surface 25 of the tub 24. The channel formed inside the air pulverizing pipe 110 according to the present embodiment is formed to be perpendicular to the ground or the bottom surface 25 of the tub 24.
The first pipe 120 is disposed below the second pipe 130. However, the water flows from the lower side to the upper side, and thus, the first pipe 120 is disposed on an upstream side of the second pipe 130. In the first pipe 120, the cross-sectional area is reduced in flow direction of the water. A length of the channel formed by the first pipe 120 is shorter than a length of the channel formed by the second pipe 130. A diameter of the channel on a lower end portion 122d of the first 120 is smaller than a diameter of the channel on an upper end portion 134d of the second pipe 130.
The first pipe 120 may include a first pipe lower portion 122 of which a cross-sectional area is rapidly reduced to reduce the pressure of the water flowing into the air pulverizing pipe 110, and a first pipe upper portion 124 which is disposed upwardly or on a downstream side of the first pipe lower portion 122 and increases or maintains a flow velocity of the water flowing in through the first pipe lower portion 122.
The first pipe lower portion 122 is disposed below the first pipe upper portion 124. A change ratio of the cross-sectional area of the first pipe upper portion 124 is larger than a change ratio of the cross-sectional area of the first pipe lower portion 122.
The cross-sectional area of the first pipe lower portion 122 is rapidly reduced from the upstream side to the downstream side. A reduction ratio of the cross-sectional area of the first pipe lower portion 122 is larger than that of the first pipe upper portion 124. The pressure of the water flowing through the first pipe 120 of the air pulverizing pipe 110 is reduced while passing through the first pipe lower portion 122 and the first pipe upper portion 124, and thus, a negative pressure may be formed.
The second pipe 130 is disposed above the first pipe 120. The second pipe 130 is disposed on a downstream side of the first pipe 120. The cross-sectional area of the second pipe 130 increases in the flow direction of the water, and pressurizes the water. The water moving along the second pipe 130 is pressurized, and thus, the air flowing into the air pulverizing pipe 110 through the air inlet hole 146 is secondarily pulverized.
The second 130 is formed to be longer than the first pipe 120. The second pipe 130 according to the present embodiment may include a second pipe lower portion 132 which primarily pressurizes the water coming from the first pipe 120 and a second pipe upper portion 134 which secondarily pressurizes the water passing through the second pipe lower portion 132. The second pipe lower portion 132 slowly pressurizes the water compared with the second pipe upper portion 134. A change ratio of a cross-sectional area of the second pipe lower portion 132 is smaller than that of the second pipe upper portion 134. That is, referring to FIGS. 6 and 7, a length of a channel of the second pipe lower portion 132 formed in an up-down direction is longer than a length of a channel of the second pipe upper portion 134. A difference between inner diameters of both end portions of the second pipe lower portion 132 in the up-down direction is smaller than a difference between inner diameters of both end portions of the second pipe upper portion 134 in the up-down direction.
In the second pipe lower portion 132, the air flowing into the air inlet hole 146 is pulverized by the flow velocity and the centrifugal force of the water. In the second pipe upper portion 134, the cross section is rapidly extended. Accordingly, the water is pressurized, and the air existing inside the water can be effectively pulverized.
The second pipe 130 may further include an extended pipe portion 136 which maintains the cross section extended by the second pipe upper portion 134. The extended pipe portion 136 is connected to an inner peripheral surface 185 of an air tab peripheral surface 184 described below. The extended pipe portion 136 and the inner peripheral surface 185 of the air tab peripheral surface 184 can adjust a distance of the air tab 180 separated from the air inlet hole 146. In order to effectively pulverize the air by the air tab 180 described below, preferably, a distance H1 of the air tab 180 separated from the air inlet hole 146 is equal to or more than a diameter 180d of the air tab 180. Accordingly, a sum H1 of the lengths of the channel formed by the second pipe lower portion 132, the second pipe upper portion 134, the extended pipe portion 136, and the inner peripheral surface (185) of the air tab peripheral surface 184 is equal to or more than the diameter 180d of the air tab 180.
The air inlet hole 146 is formed on an upstream end portion of the second pipe 130, so to say at the beginning of the second pipe 130. The air inlet hole 146 is formed on a lower end portion 132a of the second pipe 130.
The air inlet hole 146 may be formed between the first pipe 120 and the second pipe 130. The air inlet hole 146 is formed in a portion at which the cross section of the first pipe 120 is reduced. The air inlet hole 146 is formed at the upstream end portion of the second pipe 130. The air inlet hole 146 may be formed at a point at which the reduction in the pressure of the first pipe 120 ends. The air inlet hole 146 may be formed at a point at which the pressurization by the second pipe 130 starts.
The inside of the air pulverizing pipe 110 and the outside of the air pulverizing pipe 110 communicate with each other through the air chamber 150 described later by the air inlet hole 146. In the air pulverizing pipe 110 according to the present embodiment, the external air can flow to the inside of the air pulverizing pipe 110 through the air inlet hole 146. Here, the outside indicates the outside of the air pulverizing pipe 110, and may include not only an outside of the cabinet 20 but also the space inside the cabinet 20 and may be an internal space of the tub 24.
The pressure of the water flowing through the air pulverizing pipe 110 is reduced while passing through the first pipe 120. A negative pressure is generated by the reduction in the pressure of the water passing through the first pipe 120, and thus, the external air is sucked into the air pulverizing pipe 110 through the air inlet hole 146. The air flowing into the air pulverizing pipe 110 through the air inlet hole 146 is primarily pulverized by the rotating current flowing at a high speed along the first pipe 120.
The air inlet hole 146 is disposed between the first pipe 120 and the second pipe 130, extends radially from the discharge end portion 124a of the first pipe 120, and includes the extended surface portion 126 which expands the area of flow path of the inlet end portion 132a of the second pipe 130.
Accordingly, the air inlet hole 146 formed on the peripheral surface 131 of the second pipe 130 is disposed to be radially separated from the discharge end portion 124a of the first pipe 120 by a gap in which the extended surface portion 126 is formed.
The extended surface portion 126 forms a stepped portion between the first pipe 120 and the second pipe 130. The extended surface portion 126 can reduce a noise generated by a friction between the air flowing in through the air inlet hole 46 and the water flowing to the second pipe 130 through the first pipe 120.
A diameter of the lower end portion 132a of the second pipe 130 is larger than a diameter 124d of the flow path cross section of the upper end portion 124a of the first pipe 120. The flow path cross section of the upstream end portion of the second pipe 130 extends by a predetermined gap or more than that of the downstream end portion of the first pipe 120. The diameter 132d of the flow path cross section of the lower end portion 132a of the second pipe 130 is larger than a diameter 146d of the air inlet hole 146.
The upper end portion 124a of the first pipe 120 is connected to the lower end portion 132a of the second pipe 130 through the extended surface portion 126 expanding the flow path cross section. The extended surface portion 126 formed in the lower end portion 132a of the second pipe 130 expands the gap 132d between the air inlet hole 146 and the inner surface of the second pipe 130 facing the air inlet hole 146.
Accordingly, it is possible to reduce the noise generated by the air flowing into the air pulverizing pipe 110 through the air inlet hole 146 collides with the inner surface of the second pipe 130 facing the air inlet hole 146.
The air chamber 150 which reduces the noise generated in the air pulverizing pipe 110 may be disposed on one side of the air pulverizing pipe 110 according to the present embodiment. The air chamber 150 reduces the noise transmitted to the outside through the air inlet hole 146.
The air chamber 150 according to the present embodiment forms a space into which the noise is transmitted. The air chamber 150 according to the present embodiment is disposed outside the air pulverizing pipe 110 in which the air inlet hole 146 is formed. The air chamber 150 according to the present embodiment includes the air inlet hole 146 which can communicate with the inside of the air pulverizing pipe 110 on one side of the lower end portion.
The air inlet hole 146 according to the present embodiment is formed on the lower end portion of the air chamber 150. Accordingly, even when the water flows into the chamber 150, the water is extracted to the air inlet hole 146 formed on the lower end portion of the air chamber 150, and thus, the water is not accumulated inside the air chamber 150. An outside air inflow hole 168 through which the outside air flows into the air chamber 150 is formed in the air chamber 150 according to the present embodiment. The outside air inflow hole 168 according to the present embodiment is formed in an upper end portion of the air chamber 150. Accordingly, the water flowing into the air chamber 150 is prevented from being extracted to the outside of the air chamber 150.
The air chamber 150 according to the present embodiment is disposed outside the air pulverizing pipe 110 in which the air inlet hole 146 is formed. A space is formed inside the air chamber 150 according to the present embodiment, and the air chamber 150 includes a chamber body 152 of which one side is open and a chamber cover 154 which covers the open one side of the chamber body 152.
The chamber body 152 according to the present embodiment protrudes from one side of the air pulverizing pipe 110 to form a space therein and may be integrally formed with the air pulverizing pipe 110. Moreover, the chamber cover 154 may be configured to be separated from the chamber body 152 so as to be coupled to the chamber body 152.
The chamber body 152 and the chamber cover 154 according to the present embodiment communicate with the inner flow path of the air pulverizing pipe 110 and may be constituted by configurations separated from each other to form a space into which the noise is propagated. The chamber body 152 and the chamber cover 154 are manufactured into the configurations separated from each other and coupled to each other, and thus, it is possible to secure the space inside the air chamber 150. The chamber cover 154 may be coupled to the chamber body 152 in a fusion method.
The chamber body 152 according to the present embodiment may be disposed on the one side forming a periphery of the air pulverizing pipe 110 so that a coupling process including a separate manufacturing process can be omitted. The chamber body 152 according to the present embodiment is disposed on the one side forming the periphery of the air pulverizing pipe 110 and may play a role of reinforcing rigidities of the air pulverizing pipe 110 together with reinforcement protrusions 112.
The chamber body 152 according to the present embodiment is formed on an outer periphery of the air pulverizing pipe 110 in which the air inlet hole 146 is formed. The air inlet hole 146 is formed on one side of the air pulverizing pipe peripheral surface being in contact with an inner lower surface 155 of the chamber body 152. Accordingly, the water accumulated in the chamber body 152 can flow to the air inlet hole 146. One side surface of the chamber body facing the air inlet hole 146 is open. The chamber cover 154 is disposed on the open one side surface of the chamber body 152 facing the air inlet hole 146. The chamber cover 154 according to the present embodiment covers the open one side surface of the chamber body 152. The chamber cover 154 according to the present embodiment includes the outside air inflow hole 168 through which the outside air flows. In addition, the chamber cover 154 includes an external connection pipe 166 which protrudes outward in a portion in which the outside air inflow hole 168 is formed. A separate connection hose (not illustrated) which is connected to the outside of the cabinet 20 may be mounted on the external connection pipe 166.
The air chamber 150 according to the present embodiment includes an air guide pipe 158 which extends along the inner lower surface 155 of the air chamber 150 in the air inlet hole 146. The air guide pipe 158 expands a path through which the noise is propagated inside the air chamber 150 to reduce the noise. The air guide path 158 forms the inner lower surface 155 of the chamber body 152.
The air pulverizing pipe 110 according to the present disclosure includes an air tab mounting portion 116 which is formed to mount the air tab 180 above the extended pipe portion 136. The air tab mounting portion 116 according to the present embodiment is formed to have a size to mount the air tab 180 inside the air tab mounting portion 116. The air tab 180 is detachably mounted on the air tab mounting portion 116. When the air pulverizing pipe 110 is mounted on the tub 24, the air tab mounting portion 116 is disposed above the air pulverizing pipe 110. The air tab mounting portion 116 is disposed above the second pipe 130 of the air pulverizing pipe 110 in the direction in which the water flows.
The air tab mounting portion 116 is attached to the air table 180. The air tab mounting portion 116 includes a fastening groove 117 which is formed to correspond to a fastening protrusion 186 of the air tab 180. The air tab mounting portion 116 is disposed above the bottom surface 25 of the tub 24.
The air pulverizing pipe 110 according to the present embodiment includes a tub mounting portion which is attached to the bottom surface 25 of the tub 24. The tub mounting portion is formed on an outer periphery of the air pulverizing pipe 110 on the upper side of the second pipe 130. The tub mounting portion is formed on the outer peripheral surface of the air tab mounting portion 116. The tub mounting portion includes a lower fixing plate 138 which circumferentially protrudes from an outer peripheral surface of the air pulverizing pipe 110 and an upper fixing portion 140 which protrusions up toward the bottom surface of the tub 24 and is fastened to the fixing ring 190 described later.
The lower fixing plate 138 is formed in a ring shape protruding outward along the outer periphery of the air pulverizing pipe 110. The lower fixing plate 138 is disposed below the bottom surface of the tub 24. The lower fixing plate 138 is disposed to face the bottom surface 25 of the tub 24. The lower fixing plate 138 prevents the air pulverizing pipe 110 from moving upward from the bottom surface 25 of the tub 24.
A portion of the upper fixing portion 140 is disposed above the bottom surface of the tub 24. The upper fixing portion 140 forms a thread so that the fixing ring 190 is fastened to the outer peripheral surface of the air pulverizing pipe 110. The bottom surface of the tub 24 is disposed between the lower fixing plate 138 and the fixing ring 190 fastened to the upper fixing portion 140. The upper fixing portion 140 is coupled to the fixing ring 190 and prevents the air pulverizing pipe 110 from moving downward.
The fixing ring 190 has a ring shape and is fastened to the upper fixing portion 140 of the air pulverizing pipe 110. An inner peripheral surface 192 of the fixing ring 190 has a thread corresponding to the upper fixing portion 140. In the fixing ring 190, a plurality of reinforcing ribs 194 which maintain rigidities of the fixing ring 190 and function as a handle are formed along an outer periphery. The reinforcing ribs 194 are formed to be perpendicular to an outer peripheral surface of the fixing ring 190 at regular intervals.
The air pulverizing pipe 110 includes an upper portion 119 which is disposed above the bottom surface 25 of the tub 24 and a lower portion 118 which is disposed below the bottom surface 25 of the tub 24. The upper portion 119 and the lower portion 118 of the air pulverizing pipe 110 can be classified based on the lower fixing plate 138 of the tub mounting portion. In the lower portion 118 of the air pulverizing pipe 110, the first pipe 120, the air inlet hole 146, and the second pipe 130 are disposed. In the upper portion 119 of the air pulverizing pipe 110, the air tab mounting portion 116 is disposed.
The air pulverizing pipe 110 is fastened to the tub 24 between the second pipe 130 and the air tab mounting portion 116 on which the air tab 180 is mounted. In the air pulverizing pipe 110 according to the present embodiment, a large amount of air is pulverized by the second pipe 130 and the air tab 180, and vibrations and the noise may be generated. However, the air jet generator 100 according to the present embodiment is fixed to the tub 24 at the second pipe 130 and the portion adjacent to the air tab 180 in which the vibrations are generated. Accordingly, it is possible to reduce the vibrations generated in the air pulverizing pipe 110.
The bottom surface 25 of the tub 24 is disposed between the lower fixing plate 138 of the air pulverizing pipe 110 and the fixing ring 190. A sealer 196 for preventing the water flowing on the bottom surface 25 of the tub 24 from leaking downward from the bottom surface 25 of the tub 24 is disposed between the lower fixing plate 138 of the air pulverizing pipe 110 and the fixing ring 190. The sealer 196 may be disposed below and/or above the bottom surface 25 of the tub 24.
The pulverizing pipe 110 includes the reinforcing protrusions 112 which are formed to reinforce rigidities of the air pulverizing pipe 110 on the outer periphery around which the first pipe 120 and the second pipe 130 are formed. The reinforcing protrusions 112 may reinforce the first pipe 120 and the second pipe 130 which are formed to be long with a relatively small diameter.
The reinforcing protrusions 112 are formed to protrude from the outer periphery of the air pulverizing pipe 110 in a length direction in which the first pipe 120 and the second pipe 130 form the flow path. Four reinforcing protrusions 112 according to the present embodiment may be formed on the outer peripheral surface of the air pulverizing pipe 110 at an interval of 90°.
The air tab 180 has a disk shape and includes a plurality of holes 182 penetrating the air tab 180. The water passing through the second pipe 130 passes through the air tab. The air in the water is thirdly pulverized while passing the plurality of holes 182 formed in the air tab 180.
The holes 182 formed in the air tab 180 are densely disposed in the air tab 180 having a disk shape at regular intervals. The air tab 180 may be an air tab having through holes or holes which are formed to be long right and left. In addition, the air tab 180 may have cross long holes in which oval holes formed long upward and downward and oval holes formed long right and left are coupled.
As a contact area between the hole 182 formed in the air tab 180 and the air bubbles increases, a shearing force acting on the air bubbles increases and a generation amount of air bubbles increases, and thus, the long hole is more preferable than the through hole. However, if a size of the hole like the cross long hole excessively increases, reliability of the air tab decreases. Accordingly, the long hole is preferable. If the size of the hole formed in the air tab increases, the size of the pulverized air increases. Accordingly, in order to generate micro bubbles, it is preferable that the hole formed in the air tab has a predetermined size or less.
The air tab 180 includes an air tab plate 181 in which the holes 182 are formed and which forms a surface perpendicular to the flow direction of the water, an air tab peripheral surface 184 which extends in a direction perpendicular to the peripheral surface of the air tab plate 181, and a fastening protrusion 186 which protrudes radially outward on one side of the air tab peripheral surface 184.
The air tab peripheral surface 184 extends downward from the air tab plate 181. The air tab plate 181 and the air tab peripheral surface 184 may be formed in one configuration, but may be also be formed in separate configurations.
The air tab peripheral surface 184 may have a cylindrical shape having a hollow inner portion. The air tab plate 181 is disposed above the air tab peripheral surface 184. The inner peripheral surface 185 of the air tab peripheral surface 184 is mounted on the air pulverizing pipe 110, and forms a flow path to which the water inside the air pulverizing pipe 110 flows. The inner peripheral surface 185 of the air tab peripheral surface 184 may have the same diameter as that of the extended pipe portion 136 of the air pulverizing pipe 110.
The fastening protrusion 186 meshes with the fastening groove 117 of the air tab mounting portion 116 to be fastened thereto, and fixes the air tab 180 so that the air tab 180 is disposed inside the air pulverizing pipe 110.
The air tab 180 may be attached to or detached from the air pulverizing pipe 110 upward. Accordingly, when soil is accumulated in the air tab and the air tab is blocked, the air tab 180 may be detached from the air pulverizing pipe 110 to remove the soil.
An upper portion of the air tab 180 is coupled to the nozzle 200. The air tab 180 and the nozzle may be coupled to each other in a fusion method.
The air tab 180 may include a fastening member 188 for fastening the nozzle 200 disposed above the air tab 180. The fastening member 188 of the air tab 180 is formed to protrude upward on the upper portion of the air tab 180 and may have a groove into which a fastening hook 202 formed in the nozzle 200 can be inserted. The fastening member 188 of the air tab 180 is fastened to the fastening hook 202 of the nozzle 200, and thus, the nozzle 200 and the air tab 180 can be fixed to each other.
The nozzle 200 is disposed above the air pulverizing pipe 110. The nozzle 200 is disposed above the air jet generator 100 and discharges the water passing through the air jet generator 100 to the inside of the tub 24. The nozzle 200 is disposed above the air tab 180. The nozzle 200 according to the present embodiment may be coupled to the air tab 180 by a fusion method.
A lower side of the nozzle 200 is formed to abut on an upper side of the air tab 180. The nozzle 200 may include the fastening hook 202 which is fastened to the fastening member 188 of the air tab 180. The nozzle 200 is coupled to the air tab 180. Accordingly, the user rotates the nozzle protruding upward from the bottom surface 25 of the tub 24 to separate the air tab from the air pulverizing pipe 110.
The nozzle has a cylindrical shape including a hollow inside. An inflow hole 206 which is open downward toward a center is formed in a lower end portion of the nozzle 20. The nozzle 200 includes a plurality of discharge holes 204 which are formed downward outside the inflow hole 206 in a radial direction, above the inflow hole 206. The plurality of discharge holes 204 are open toward the bottom surface 25 of the tub 24. Accordingly, the water discharged through the air jet generator 100 is sprayed to the bottom surface 25 of the tub 24 so as to wash the bottom surface 25 of the tub 24.
The plurality of discharge holes 204 are formed at regular intervals along the peripheral surface of the nozzle 200. The nozzle 200 includes the plurality of discharge holes 204 along the peripheral surface thereof, and thus, the water including the air bubbles can be discharged to the bottoms surface of the tub 24 in various ways.
Four discharge holes 240 may be formed in the nozzle 200 according to the present embodiment. The four discharge holes 204 may be disposed to be separated from each other at regular angles along the peripheral surface of the nozzle 200.
The water including the air bubbles through the air jet generator 100 is discharged to the bottom surface of the tub 24 and flows to the sump. As the water flows to the bottom surface of the tub 24, the bottom surface of the tub 24 can be washed.
In the air jet generator 100 according to the present embodiment, the flow path through which the water flows is disposed to be perpendicular to the ground of the bottom surface of the tub 24. Accordingly, it is possible to minimize a region in which the water flowing through the second pipe 130 cannot flow due to a rapid expansion of the flow path in the second pipe upper portion 134.
FIGS. 8A and 8B and FIGS. 9A and 9B are views illustrating a friction range between the air and the water in the air jet generator according to the present disclosure and a friction range between the air and the water in the air jet generator in which the extended pipe portion is not provided.
As illustrated in the FIGS. 8A and 8B, when the extended pipe portion is not provided, the air flowing in through the air inlet hole comes into contact with the water discharged through the first pipe on the surface of the air inlet hole. In this case, the friction is generated at a small range, and thus, the noise is largely generated by the friction.
Meanwhile, in the case of the air jet generator of the present disclosure, as illustrated in FIGS. 9A and 9B, there is no direct friction between the air flowing in through the air inlet hole and the water discharged through the first pipe. That is, in a state where an air layer is formed around the water discharged through the first pipe, the air comes into contact with the water via the extended pipe portion.
In this case, a contact area and a friction area between the water and the air increase, and thus, it is possible to reduce the noise generated by the friction.
Hereinbefore, a preferred embodiment of the present disclosure is illustrated and described.
According to the dish washer of the present disclosure, the following one or more effects can be obtained.
First, the upper end portion of the first pipe of the air pulverizing pipe and the air inlet hole are disposed with a predetermined gap through the extended surface portion therebetween, and thus, it is possible to reduce the noise generated by the air flowing into the air pulverizing pipe.
Second, the air chamber is disposed on the path through the noise flowing into the air pulverizing pipe is propagated to the outside, and thus, the noise generated in the air pulverizing pipe can be secondarily reduced.
Third, the air inlet hole communicating with the air pulverizing pipe is formed below the air chamber, and thus, it is possible to prevent the water from remaining in the air chamber.
Effects of the present disclosure are not limited to the above-described effects, and other effects not mentioned are clearly understood by a person skilled in the art from descriptions of claims.

Claims

A dish washer comprising:
a tub (24) forming a washing space (24s);

a spray module (33) disposed inside the tub (24) for spraying water to the washing space (24s);

a sump (26) disposed under the tub (24) for storing water;

a washing pump (50) for supplying the water stored in the sump (26) to the spray module (33); and

an air jet generator (100) disposed below a bottom surface (25) of the tub (24), the air jet generator (100) is configured to receive a portion of the water discharged from the washing pump (50) to generate and discharge water having air bubbles to the washing space (24s) of the tub (24), wherein the air jet generator (100) includes:
an air pulverizing pipe (110) including a first pipe (120) forming an inlet on a lower side of the first pipe (120) and having a cross-sectional area reducing upward, a second pipe (130) disposed above the first pipe (120) and having a cross-sectional area increasing upward; and

an air tab (180) disposed at an upper portion of the second pipe (130) and having a plurality of air holes,

wherein an air inlet hole (146) is formed in the air pulverizing pipe (110) to introduce air from the outside at an inlet end portion (132a) of the second pipe (130);

characterized in that the air pulverizing pipe (110) includes an extended surface portion (126) which extends in a radial direction at a discharge end portion (124a) of the first pipe (120) and extends an area of flow path of the inlet end portion (132a) of the second pipe (130).
The dish washer of claim 1, wherein the air inlet hole (146) is disposed to be separated at a predetermined interval in a radial direction from an inner circumferential surface the discharge end portion (124a) of the first pipe (120).
The dish washer of any one of the preceding claims, wherein a diameter (132d) of the inlet end portion (132a) of the second pipe (130) is larger than a diameter (146d) of the air inlet hole (146).
The dish washer of any one of the preceding claims, wherein the extended surface portion (126) is formed perpendicularly to a flow direction of the water.
The dish washer of any one of the preceding claims, wherein the air inlet hole (146) is formed perpendicularly to a direction of a flow path through which the water flows in the second pipe (132).
The dish washer of any one of the preceding claims, wherein the first pipe (120) includes
a first pipe lower portion (122) of which a cross-sectional area is reduced so that a pressure of the water flowing in the air pulverizing pipe is reduced,

a first pipe upper portion (124) in which a change ratio of the cross-sectional area is formed to be gentler than that of the first pipe lower portion (122) so that a flow velocity of the water flowing in through the first pipe lower portion (122) increases or is maintained.
The dish washer of any one of the preceding claims, further comprising an air chamber (150) forming a space on a peripheral surface of the air pulverizing pipe (110) and through which the air inlet hole (146) and the outside communicate with each other.
The dish washer of claim 7, wherein the air chamber (150) includes an air guide pipe (158) which extends along an inner lower surface of the air chamber (150) in the air inlet hole (146).
The dish washer of any one of the preceding claims, further comprising:
a chamber body (152) forming a space and has one side opened on a peripheral surface of the air pulverizing pipe (110); and

a chamber housing cover (154) covering the opened one side of the chamber body (152).
The dish washer of any one of the preceding claims, further comprising an impeller (170) to form a swirl in the water flowing into the air pulverizing pipe (110).
The dish washer of any one of the preceding claims, further comprising:
a nozzle (200) mounted above the air pulverizing pipe (110) for discharging the water flowing upward through the air pulverizing pipe (110) to the washing space (24s) of the tub (24).
The dish washer of claim 11,
wherein the nozzle (200) is connected to the air tab (180) on the upper side of the air tab (180), wherein the nozzle (200) comprises a discharge port (204) disposed above the bottom surface (25) of the tub (24) to discharge the water to the washing space (24s).
The dish washer of claim 12, wherein the discharge port (204) formed in the nozzle (200) is formed toward the bottom surface (25) of the tub (24).